cloud-fan commented on code in PR #38497:
URL: https://github.com/apache/spark/pull/38497#discussion_r1018755179
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/EliminateResolvedHint.scala:
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@@ -31,20 +34,35 @@ object EliminateResolvedHint extends Rule[LogicalPlan] {
// This is also called in the beginning of the optimization phase, and as a
result
// is using transformUp rather than resolveOperators.
def apply(plan: LogicalPlan): LogicalPlan = {
- val pulledUp = plan transformUp {
+ val joinsWithHints = plan transformUp {
case j: Join if j.hint == JoinHint.NONE =>
val (newLeft, leftHints) = extractHintsFromPlan(j.left)
val (newRight, rightHints) = extractHintsFromPlan(j.right)
val newJoinHint = JoinHint(mergeHints(leftHints),
mergeHints(rightHints))
j.copy(left = newLeft, right = newRight, hint = newJoinHint)
}
- pulledUp.transformUp {
+ val shouldPullHintsIntoSubqueries =
SQLConf.get.getConf(SQLConf.PULL_HINTS_INTO_SUBQUERIES)
+ val joinsAndSubqueriesWithHints = if (shouldPullHintsIntoSubqueries) {
+ pullHintsIntoSubqueries(joinsWithHints)
+ } else {
+ joinsWithHints
+ }
+ joinsAndSubqueriesWithHints.transformUp {
case h: ResolvedHint =>
hintErrorHandler.joinNotFoundForJoinHint(h.hints)
h.child
}
}
+ def pullHintsIntoSubqueries(plan: LogicalPlan): LogicalPlan = {
+
plan.transformAllExpressionsUpWithPruning(_.containsPattern(PLAN_EXPRESSION)) {
+ case s: SubqueryExpression if s.hint.isEmpty =>
+ val (newPlan, subqueryHints) = extractHintsFromPlan(s.plan)
Review Comment:
question: what if the subquery is complicated and has joins, the hint is for
joins in subquery but not subquery itself?
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